body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    color: #007bff;
    text-decoration: none;
    font-weight: bold;
}

.back-link:hover {
    text-decoration: underline;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

p {
    margin-bottom: 20px;
    color: #555;
}

.formatter-container {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    width: 100%;
    margin-bottom: 30px;
}

.editor-panel, .preview-panel {
    width: 49%;
    background-color: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.toolbar-groups {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.toolbar-group {
    display: flex;
    flex-direction: column;
}

.toolbar-title {
    font-size: 0.9rem;
    font-weight: bold;
    color: #666;
    margin-bottom: 5px;
}

.toolbar {
    display: flex;
}

.toolbar button {
    background: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 8px 12px;
    cursor: pointer;
    margin-right: 5px;
    font-size: 1rem;
}

.toolbar button:hover {
    background-color: #f0f0f0;
}

#text-input, #preview-output {
    width: 100%;
    height: 300px;
    border: 1px solid #ccc;
    border-radius: 6px;
    padding: 15px;
    box-sizing: border-box;
    font-size: 1rem;
    line-height: 1.5;
    overflow-y: auto;
}

#clear-btn {
    margin-top: 10px;
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
}

#clear-btn:hover {
    background-color: #c82333;
}

#preview-output {
    background-color: #f8f9fa;
    white-space: pre-wrap;
}

#copy-text-btn {
    display: block;
    width: 100%;
    padding: 12px;
    margin-top: 15px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: background-color 0.2s;
}

#copy-text-btn:hover {
    background-color: #0056b3;
}

.seo-content {
    margin-top: 40px;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.seo-content h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.seo-content h3 {
    font-size: 1.4rem;
    margin-top: 20px;
    margin-bottom: 10px;
}

.seo-content ul {
    list-style-type: disc;
    padding-left: 20px;
}

.seo-content ul li {
    margin-bottom: 10px;
}